GB8430291D0 - Rotary drill bits - Google Patents

Rotary drill bits

Info

Publication number
GB8430291D0
GB8430291D0 GB848430291A GB8430291A GB8430291D0 GB 8430291 D0 GB8430291 D0 GB 8430291D0 GB 848430291 A GB848430291 A GB 848430291A GB 8430291 A GB8430291 A GB 8430291A GB 8430291 D0 GB8430291 D0 GB 8430291D0
Authority
GB
United Kingdom
Prior art keywords
drill bits
rotary drill
rotary
bits
drill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB848430291A
Other versions
GB2151283B (en
GB2151283A (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NL Petroleum Products Ltd
Original Assignee
NL Petroleum Products Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB838332343A external-priority patent/GB8332343D0/en
Priority claimed from GB848405179A external-priority patent/GB8405179D0/en
Application filed by NL Petroleum Products Ltd filed Critical NL Petroleum Products Ltd
Publication of GB8430291D0 publication Critical patent/GB8430291D0/en
Publication of GB2151283A publication Critical patent/GB2151283A/en
Application granted granted Critical
Publication of GB2151283B publication Critical patent/GB2151283B/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56—Button-type inserts
    • E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
GB08430291A 1983-12-03 1984-11-30 Improvements in rotary drill bits Expired GB2151283B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838332343A GB8332343D0 (en) 1983-12-03 1983-12-03 Rotary drill bits
GB848405179A GB8405179D0 (en) 1984-02-28 1984-02-28 Rotary drill bits

Publications (3)

Publication Number Publication Date
GB8430291D0 true GB8430291D0 (en) 1985-01-09
GB2151283A GB2151283A (en) 1985-07-17
GB2151283B GB2151283B (en) 1987-04-08

Family

ID=26287070

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08430291A Expired GB2151283B (en) 1983-12-03 1984-11-30 Improvements in rotary drill bits

Country Status (5)

Country Link
EP (1) EP0145422A3 (en)
AU (1) AU3592584A (en)
BR (1) BR8406134A (en)
GB (1) GB2151283B (en)
NO (1) NO844770L (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU578637B2 (en) * 1983-12-03 1988-11-03 N.L. Petroleum Products Ltd. Rotary drill bits and cutting elements for such bits
GB8418481D0 (en) * 1984-07-19 1984-08-22 Nl Petroleum Prod Rotary drill bits
US4781256A (en) * 1984-12-14 1988-11-01 Nl Petroleum Products Limited Cutting structures for rotary drill bits
GB8431633D0 (en) * 1984-12-14 1985-01-30 Nl Petroleum Prod Cutting structures for rotary drill bits
US4694918A (en) * 1985-04-29 1987-09-22 Smith International, Inc. Rock bit with diamond tip inserts
AU577958B2 (en) * 1985-08-22 1988-10-06 De Beers Industrial Diamond Division (Proprietary) Limited Abrasive compact
US4730682A (en) * 1985-12-23 1988-03-15 Ingersoll-Rand Company Erosion resistant rock drill bit
US4719979A (en) * 1986-03-24 1988-01-19 Smith International, Inc. Expendable diamond drag bit
US5111895A (en) * 1988-03-11 1992-05-12 Griffin Nigel D Cutting elements for rotary drill bits
GB8805789D0 (en) * 1988-03-11 1988-04-13 Reed Tool Co Improvements in/relating to cutter assemblies for rotary drill bits
GB2218131B (en) * 1988-05-06 1992-03-25 Reed Tool Co Improvements in or relating to rotary drill bits
EP0384623B1 (en) * 1989-02-14 1994-03-02 Camco Drilling Group Limited Improvements in or relating to cutting elements for rotary drill bits
GB2273306B (en) * 1992-12-10 1996-12-18 Camco Drilling Group Ltd Improvements in or relating to cutting elements for rotary drill bits

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2719330C3 (en) * 1977-04-30 1984-01-05 Christensen, Inc., 84115 Salt Lake City, Utah Rotary drill bit
US4244432A (en) * 1978-06-08 1981-01-13 Christensen, Inc. Earth-boring drill bits
EP0032428B1 (en) * 1980-01-10 1986-08-27 Stonehouse U.K. Limited Rotary drill bits
US4593777A (en) * 1983-02-22 1986-06-10 Nl Industries, Inc. Drag bit and cutters

Also Published As

Publication number Publication date
EP0145422A2 (en) 1985-06-19
GB2151283B (en) 1987-04-08
GB2151283A (en) 1985-07-17
EP0145422A3 (en) 1986-05-28
NO844770L (en) 1985-06-04
AU3592584A (en) 1985-06-06
BR8406134A (en) 1985-09-24

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee